Low power optical nonlinearities are a crucial requirement for data routing and next generation all-optical processing.
The majority of nonlinear optical devices to date exploit weak nonlinearities from a large ensemble of atomic systems,
resulting in both high power dissipation and a large device footprint. Quantum dots (QDs) coupled to photonic crystals
can provide significant reduction in both device size and power dissipation. The interaction between these two systems
creates extremely strong light-matter interaction owing to the tight optical confinement of photonic crystals and large oscillator strengths of QDs. Such interactions enable optical nonlinearities near the single photon level. In this work we investigate the nonlinear properties of QDs coupled to photonic crystals. We demonstrate large optical Stark shift with only 10 photons. We then propose and demonstrate a novel photonic circuit that can route light on a chip with extremely low optical powers.
We describe an effect called Dipole Induced Transparency which enables a dipole emitter to strongly modify the
cavity spectrum, even in the weak coupling regime. We then describe a method for generating entanglement and
performing a full Bell measurement between two QDs using Dipole Induced Transparency. Finally, we show how
DIT enables entanglement between QDs with vastly different radiative properties. The proposal is shown to be
robust to cavity resonance mismatch.
We describe an effect called Dipole Induced Transparency which enables a dipole emitter to strongly modify the
cavity spectrum, even in the weak coupling regime. We then describe a method for generating entanglement and
performing a full Bell measurement between two QDs using Dipole Induced Transparency. Finally, we show how
DIT enables entanglement between QDs with vastly different radiative properties. The proposal is shown to be
robust to cavity resonance mismatch.
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